System for Identifying Paired Id Cards

1. An ID card, identifying by a card reader, wherein the card reader comprises: a card placement position; a transmission unit, for outputting a transmission signal; a plurality of receiving units, for receiving the transmission signal; and a control circuit, coupled to the transmission unit and the plurality of receiving units, for controlling the transmission unit to output the transmission signal and determining an ID code according to receiving unit(s) which receives the transmission signal; wherein the ID card comprises: a first card case; a first conducting electrode, disposed in the first card case, wherein the first conducting electrode is disposed on a position corresponding to the transmission unit when the ID card is disposed on the card placement position of the card reader; and at least a second conducting electrode, disposed in the first card case, wherein at least a second conducting electrode is electrically connected to the first conducting electrode to represent a specific ID, wherein at least a second conducting electrode is disposed on a position corresponding to one of the receiving units when the ID card is disposed on the card placement position of the card reader; wherein the transmission unit transmits the transmission signal when the ID card is close to the card reader, and the control circuit determines a specific ID code of the ID card according to receiving unit(s) which receives the transmission signal, wherein the first conducting electrode is disposed on a first side of the first card case, and the second conducting electrode(s) is/are disposed on the first side of the first card case, wherein the card reader further comprises: a second transmission unit, coupled to the control circuit, for outputting a second transmission signal; and a plurality of second receiving units, coupled to the control circuit, for receiving the second transmission signal; wherein a slave ID card comprises: a second card case; a third conducting electrode, disposed in the second card case and disposed to a second side of the second card case, wherein the third conducting electrode is disposed on a position corresponding to the second transmission unit when the slave ID card is disposed on the card placement position; and at least a fourth conducting electrode, disposed in the second card case and disposed to the second side of the second card case, wherein at least a fourth conducting electrode is electrically connected to the third conducting electrode to represent a specific slave ID, wherein at least a fourth conducting electrode is disposed on a position corresponding to one of the receiving units when the slave ID card is disposed on the card placement position of the card reader, wherein the card placement position is divided into a first side and a second side, wherein the transmission unit and the plurality of receiving units are disposed on the first side of the card placement position corresponding to the first side of the first card case, wherein the second transmission unit and the plurality of second receiving units is disposed on the second side of the card placement position corresponding to the second side of the second card case.

2. The ID card according to claim 1 , wherein the ID card is a circle ID card, and the first conducting electrode is disposed to a center of the ID card, wherein the transmission unit is disposed to a center of the card placement position, and the receiving units are disposed around the transmission unit.

3. The ID card according to claim 2 , wherein at least a second conducting electrode is disposed around the first conducting electrode of the ID card.

4. A system for identifying ID, comprising: a card reader, for identifying an ID, wherein the card reader comprises: a card placement position; a transmission unit, for outputting a transmission signal; a plurality of receiving units, for receiving the transmission signal; and a control circuit, coupled to the transmission unit and the receiving units, for controlling the transmission unit to output the transmission signal and determining an ID code according to receiving unit(s) which receives the transmission signal; at least an ID card, each ID card comprising: a first card case; a first conducting electrode, disposed in the first card case, wherein the first conducting electrode is disposed on a position corresponding to the transmission unit when the ID card is disposed on the card placement position of the card reader; and at least a second conducting electrode, disposed in the first card case, wherein at least a second conducting electrode is electrically connected to the first conducting electrode to represent a specific ID, wherein at least a second conducting electrode is disposed on a position corresponding to one of the receiving units when the ID card is disposed on the card placement position of the card reader; wherein the transmission unit transmits the transmission signal when the ID card is close to the card reader, and the control circuit determines a specific ID code of the ID card according to receiving unit(s) which receives the transmission signal, wherein the first conducting electrode is disposed on a first side of the first card case, and the second conducting electrode(s) is/are disposed on the first side of the first card case, wherein the card reader further comprises: a second transmission unit, coupled to the control circuit, for outputting a second transmission signal; and a plurality of second receiving units, coupled to the control circuit, for receiving the second transmission signal; wherein a slave ID card comprises: a second card case; a third conducting electrode, disposed in the second card case and disposed to a second side of the second card case, wherein the third conducting electrode is disposed on a position corresponding to the second transmission unit when the slave ID card is disposed on the card placement position; and at least a fourth conducting electrode, disposed in the second card case and disposed to the second side of the second card case, wherein at least a fourth conducting electrode is electrically connected to the third conducting electrode to represent a specific slave ID, wherein at least a fourth conducting electrode is disposed on a position corresponding to one of the receiving units when the slave ID card is disposed on the card placement position of the card reader, wherein the card placement position is divided into a first side and a second side, wherein the transmission unit and the plurality of receiving units are disposed on the first side of the card placement position corresponding to the first side of the first card case, wherein the second transmission unit and the plurality of second receiving units is disposed on the second side of the card placement position corresponding to the second side of the second card case.

5. The system according to claim 4 , wherein the ID card is a circle ID card, and the first conducting electrode is disposed to a center of the ID card, wherein the transmission unit is disposed to a center of the card placement position, and the receiving units are disposed around the transmission unit.

6. The system according to claim 5 , wherein at least a second conducting electrode is disposed around the first conducting electrode of the ID card.

7. A system for identifying ID, comprising: a card reader, for identifying an ID, wherein the card reader comprises: a card placement position; a transmission unit, for outputting a transmission signal; a plurality of receiving units, for receiving the transmission signal; and a control circuit, coupled to the transmission unit and the receiving units, for controlling the transmission unit to output the transmission signal and determining an ID code according to receiving unit(s) which receives the transmission signal; at least an ID card, each ID card comprising: a first card case; a first conducting electrode, disposed in the first card case, wherein the first conducting electrode is disposed on a position corresponding to the transmission unit when the ID card is disposed on the card placement position of the card reader; and a plurality of electrode fixed positions, disposed in the first card case, for disposing at least a second conducting electrode, wherein at least a specific second conducting electrode is electrically connected to the first conducting electrode to represent a specific ID, wherein the plurality of electrode fixed positions are disposed on the positions corresponding to the receiving units when the ID card is disposed on the card placement position of the card reader; wherein the transmission unit transmits the transmission signal when the ID card is close to the card reader, and the control circuit determines a specific ID code of the ID card according to receiving unit(s) which receives the transmission signal, wherein the first conducting electrode is disposed on a first side of the first card case, and the electrode fixed position(s) is/are disposed on the first side of the first card case, wherein the card reader further comprises: a second transmission unit, coupled to the control circuit, for outputting a second transmission signal; and a plurality of second receiving units, coupled to the control circuit, for receiving the second transmission signal; wherein a slave ID card comprises: a second card case; a third conducting electrode, disposed in the second card case and disposed to a second side of the second card case; and a plurality of second electrode fixed positions, disposed on and arranged in the second card case, and disposed on the second side of the second card case, for disposing at least a fourth conducting electrode, wherein at least a fourth conducting electrode is electrically connected to the third conducting electrode to represent a specific slave ID, wherein the third conducting electrode is disposed on a position corresponding to the second transmission unit when the slave ID card is disposed on the card placement position, wherein the second electrode fixed positions are disposed on the positions corresponding to the second receiving units when the ID card is placed on the card placement position of the card reader, wherein the card placement position is divided into a first side and a second side, wherein the transmission unit and the plurality of receiving units are disposed on the first side of the card placement position corresponding to the first side of the first card case, wherein the second transmission unit and the plurality of second receiving units is disposed on the second side of the card placement position corresponding to the second side of the second card case.

8. The system according to claim 7 , wherein the ID card is a circle ID card, and the first conducting electrode is disposed to a center of the ID card, wherein the transmission unit is disposed to a center of the card placement position, and the receiving units are disposed around the transmission unit.

9. The system according to claim 8 , wherein the electrode fixed positions are disposed around the first conducting electrode of the ID card.